zourdough HAS HUNDREDS OF RECIPES WAITING FOR YOU ALSO!!! San Francisco SOURDOUGH STARTER, old yeast, at least a decade old.......................................... VERY STRONG, very very sour extremely active and always fresh. Make bread, pizza crust, rolls, lots of recipes included. Seriously from San Francisco, has the lactobicillia specific to that area. This is our flagship, San Francisco sourdough starter yeast, dried and pulverized for quick activation. We are making a market here . Over time we will be adding an alaskan sourdough yeast and a frontier sourdough yeast, both of which have a long history and have been cultivated to stay in their original form. We also include recipes for the perfect loaf, pizza dough, bread rolls and lots of help. Have fun with our starters and enjoy Instructions are included to activate our starter, in fact it's so simple here they are: Mix 1/2 cup all purpose flour, 1/2 cup lukewarm pure water, add 1 tablespoon sugar this time only package of starter powder in a plastic bowl Cover bowl and put on the counter On the second day just stir it up. On the third day add an additional 1/2 cup all purpose flour and 1/2 cup of lukewarm water By 48 hours you should see bubbles On the fourth day add 1/2 cup lukewarm water and 1/2 cup all purpose flour Feeding your starter daily for about 5 days will help it reach full activity and flavor. AND now its ready to bake with, use our recipes, use your own, its all good. Our item is vacuum sealed and has an expiration date of 12/30/2035